Pictures of the day: 15 November 2012

This Nasa image shows the movement of global aerosols across the planet. An aerosol is a suspension of liquid droplets or solids in the atmosphere. Dust (red) is lifted from the surface, sea salt (blue) swirls inside cyclones, smoke (green) rises from fires, and sulphate particles (white) stream from volcanoes and fossil fuel emissions.Picture: Nasa